Dust cap



March 30 1926. 1,578,567

A. H. WICKS DUST GAP Filed Sept. 26. 1923 Patented Mar. 30, 1926,

DUST

ARTHUR H. w xs, or'woons'noominnivorsl ioAr;

Application-Lined?September26, 1923: Sefia1 l \lof664,895,

1" "0 aZZ whom it may concern":

Belt known that I,An rHUR HQWrens;

a citizen the- United -States, residing, at

Woodstock, in the county of 'McHenry and State of Illinois, haveinvented a certain new and useful Improvement. inlDnst Capznf of whichthe following. is a. full,"clear, col c T cise, and exact description,reference being. had to the accompanying drawings, forming-a part of ths specification. r

M invention relates'to dustcapsifbrt valves, and more particularly to. aquickl detachable dost cap.v i 1 It is a purpose of.

invention to pro;

vide a simple, .q'niclily cetaehable dustl cap.

which can be very m asl -and-snapiy made itl'lillVlllCll s firmly heldin frictional clam ing engagement- With a valve stem When in positiondue-totl1e-resiliency thereof.

My improved dust cap made of. sheet metal and is not provided with anyprojections, threads or otherdevice to engage with the threads on thevalve stem but, instead, is made of a crosssectional shape similar to tr1'11. 0 t 1 'material Where thelapped joint occnrs can move over eachother and act substantially as a coil clock springwould act.

'ld-oreover, myimproved cap is preferably tapered so as tobeconsiderably smaller at omitted. i K e v p Referring in detail to thedrawings, n! Fig. 1"'1 s shown a fragment" ofa Wheel fQllV',

. 1,0 ith a valve stemll'projectingthn y from, sliowing..my} improveddust cap; in

longitudinalsection in position thereon;

F g. 2 1s a s de elevat onof my IXDPIQYG" dust cap, showing tliepositionwhich it a stem in dotted linesg a-nd" Y from, said valve stem being,threadedat" I 7 as is customary andh aving." tliefiattened "portions 13as is-Well lino-W11. Thefl'val vt-a mechanism is valve, cap 14.

provided with; {the ordinary M unted on said' valve" 15 and a closed endp0rtion'16. The body made of a sheet of materialhaving over lappingportions -17 and 18 at the edges 80. that of a coil spring having alittle over one thereof that extend longitudinally the P-I V Thus,'-alapped joint is provided exte ding longitudinally of the cap withtheoverlap ping portions 17 and 18'thereof free'to move. 7 I over eachother. As thematerial from which 5 the cap is made should be'resilientsheet metal, it isevident from Fig. 8that the cap Will in effect be acoil springhaving slightly more than asingle coil of-the widthcorresponding tothe length of the cap from the open end thereof to theportion 19 thereof V Where the side Wall portion joins the closed endWallportion oft-he cap.

. 6osumes When forccd on thethreaded val've' I g- 3yis an enlargedsectional view-taken "on the line 3'3 of Fig'fl, the valve mechanismcontained With n the valve stem being; 5

p v stenris myfiin Z5 proved dust cap comprising a body portion i Theopen end of the dust cap is bea ded, over at 20, as indicated inFigs. 1.and 2, said beading being beveled off as indicated theopen end thereofthan at theclosed end. The open end of the cap is preferably smallerthan the threaded portion of the valve stem and, accordingly, the cap\villgrip the valve stem threads with a spring action.

Other objects and advantages of the nvention will appear as thedescription of the accompanying drawings proceeds. 'However, I desire tohave it distinctly understood that I do not intend to limit myself tothe exact details shown or describedlnit that I intend to include aspart of my inventioi'r all such obvious changes and modifications ofparts as would occur to a person skilled" in this art and as would fallWithin the scope of the claims.

In the dIaWIIIgSZ' v Fig. 1 1S a fragmentary viewof a Wheel felly With avalve stem'projecting there at 2l so as to 'permit sliding of the beadsover each other-in asi'milar manner to the overlapping portions 17 and18.

Preferably, the dust cap is tapered, asiindicated in Fig. 2, being ofsmaller diameter at the lower end 22 thereof than at the por- H 1 tion19thereof. Said open end portion 22 of the dust cap Whenlin thepositionshorvn in full linesin Fig.2, Which isithe normal position of thematerial.v of said cap, is of considerably smaller diameterthanv thethreaded portion of the valve stem. Ac-

cordingly, When'the'dust cap is forced on" the valve stem the side Wallportion thereof Will assume the position shownin' dotted lines in Fig. 2andthe capjwill gripthe valve stem with-a spring action; The end vbevaried.

of the sidewall portion adjacent the closed 7 end of the cap ispreferablyof substantially the same size as the valve: stem,..as thesaid end thereof will be substantially of the same diameter due to theolosedjend being adjacent thereto." Howeverg from the portion 19 wherethe elosed end'and the side wall portion join to thewopen end of thecap, the gap will have a gradually"deoreasing diameter an'da graduall'y"iner'ea'sing spring action.

I Havingthusdesoribedmyi11vention,v hat I desire to claim andseourebyUnited States Letters Patent is z 1. A dust cap having body portionoi?spring metal having overlapping edges ex- 2. A dust cap havin'ga bodyportion of i sheet metalhavingoverlapping free edges extendinglengthwise of said cap, said body portion being distortable so'that saidedges slide over each other, whereby the diameter v of said cap may bevaried, said cap-deore'as s free edges.

ingin normalydi'ameter toward the open end thereof, and said edgesoverlapping at all times tomaintain a dust tight joint at said 3. A dustcap lap of said'edg'es increasing from adjacent the closed end of saidcap toward the open times to form a dust tightcap. i p t 4. A'dust caphaving a body portion of resilient material provided with closed endanda' side wall portion having overlap ping free edges, said overlappingedges extending from said closed end to the open end of said cap, theo-verlap thereof increasing having a body portion hav: 7 i ingoverlapping free edges extending 'lengthwise of said cap, the normalamount of over-'- end thereof the amount of overlap of said edges beingsuch that the same overlap at all 4O o 7 toward said open end to providea body 7 portion normally tapering toward the'open end of said cap theamount of overlap 01"- 1 said edges 'being'sueh that the same overlap atall times to form a dust tight'oap. V

[In witnesswhereofi hereunto subscribe r my name this 15th day ofsept bA21)" ARTHUR H.;WICKS.

